xref: /openbmc/linux/drivers/clk/imx/clk-busy.c (revision 11f68120)
111f68120SShawn Guo /*
211f68120SShawn Guo  * Copyright 2012 Freescale Semiconductor, Inc.
311f68120SShawn Guo  * Copyright 2012 Linaro Ltd.
411f68120SShawn Guo  *
511f68120SShawn Guo  * The code contained herein is licensed under the GNU General Public
611f68120SShawn Guo  * License. You may obtain a copy of the GNU General Public License
711f68120SShawn Guo  * Version 2 or later at the following locations:
811f68120SShawn Guo  *
911f68120SShawn Guo  * http://www.opensource.org/licenses/gpl-license.html
1011f68120SShawn Guo  * http://www.gnu.org/copyleft/gpl.html
1111f68120SShawn Guo  */
1211f68120SShawn Guo 
1311f68120SShawn Guo #include <linux/clk.h>
1411f68120SShawn Guo #include <linux/clk-provider.h>
1511f68120SShawn Guo #include <linux/io.h>
1611f68120SShawn Guo #include <linux/slab.h>
1711f68120SShawn Guo #include <linux/jiffies.h>
1811f68120SShawn Guo #include <linux/err.h>
1911f68120SShawn Guo #include "clk.h"
2011f68120SShawn Guo 
2111f68120SShawn Guo static int clk_busy_wait(void __iomem *reg, u8 shift)
2211f68120SShawn Guo {
2311f68120SShawn Guo 	unsigned long timeout = jiffies + msecs_to_jiffies(10);
2411f68120SShawn Guo 
2511f68120SShawn Guo 	while (readl_relaxed(reg) & (1 << shift))
2611f68120SShawn Guo 		if (time_after(jiffies, timeout))
2711f68120SShawn Guo 			return -ETIMEDOUT;
2811f68120SShawn Guo 
2911f68120SShawn Guo 	return 0;
3011f68120SShawn Guo }
3111f68120SShawn Guo 
3211f68120SShawn Guo struct clk_busy_divider {
3311f68120SShawn Guo 	struct clk_divider div;
3411f68120SShawn Guo 	const struct clk_ops *div_ops;
3511f68120SShawn Guo 	void __iomem *reg;
3611f68120SShawn Guo 	u8 shift;
3711f68120SShawn Guo };
3811f68120SShawn Guo 
3911f68120SShawn Guo static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
4011f68120SShawn Guo {
4111f68120SShawn Guo 	struct clk_divider *div = container_of(hw, struct clk_divider, hw);
4211f68120SShawn Guo 
4311f68120SShawn Guo 	return container_of(div, struct clk_busy_divider, div);
4411f68120SShawn Guo }
4511f68120SShawn Guo 
4611f68120SShawn Guo static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
4711f68120SShawn Guo 						  unsigned long parent_rate)
4811f68120SShawn Guo {
4911f68120SShawn Guo 	struct clk_busy_divider *busy = to_clk_busy_divider(hw);
5011f68120SShawn Guo 
5111f68120SShawn Guo 	return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
5211f68120SShawn Guo }
5311f68120SShawn Guo 
5411f68120SShawn Guo static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
5511f68120SShawn Guo 					unsigned long *prate)
5611f68120SShawn Guo {
5711f68120SShawn Guo 	struct clk_busy_divider *busy = to_clk_busy_divider(hw);
5811f68120SShawn Guo 
5911f68120SShawn Guo 	return busy->div_ops->round_rate(&busy->div.hw, rate, prate);
6011f68120SShawn Guo }
6111f68120SShawn Guo 
6211f68120SShawn Guo static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
6311f68120SShawn Guo 		unsigned long parent_rate)
6411f68120SShawn Guo {
6511f68120SShawn Guo 	struct clk_busy_divider *busy = to_clk_busy_divider(hw);
6611f68120SShawn Guo 	int ret;
6711f68120SShawn Guo 
6811f68120SShawn Guo 	ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
6911f68120SShawn Guo 	if (!ret)
7011f68120SShawn Guo 		ret = clk_busy_wait(busy->reg, busy->shift);
7111f68120SShawn Guo 
7211f68120SShawn Guo 	return ret;
7311f68120SShawn Guo }
7411f68120SShawn Guo 
7511f68120SShawn Guo static struct clk_ops clk_busy_divider_ops = {
7611f68120SShawn Guo 	.recalc_rate = clk_busy_divider_recalc_rate,
7711f68120SShawn Guo 	.round_rate = clk_busy_divider_round_rate,
7811f68120SShawn Guo 	.set_rate = clk_busy_divider_set_rate,
7911f68120SShawn Guo };
8011f68120SShawn Guo 
8111f68120SShawn Guo struct clk *imx_clk_busy_divider(const char *name, const char *parent_name,
8211f68120SShawn Guo 				 void __iomem *reg, u8 shift, u8 width,
8311f68120SShawn Guo 				 void __iomem *busy_reg, u8 busy_shift)
8411f68120SShawn Guo {
8511f68120SShawn Guo 	struct clk_busy_divider *busy;
8611f68120SShawn Guo 	struct clk *clk;
8711f68120SShawn Guo 	struct clk_init_data init;
8811f68120SShawn Guo 
8911f68120SShawn Guo 	busy = kzalloc(sizeof(*busy), GFP_KERNEL);
9011f68120SShawn Guo 	if (!busy)
9111f68120SShawn Guo 		return ERR_PTR(-ENOMEM);
9211f68120SShawn Guo 
9311f68120SShawn Guo 	busy->reg = busy_reg;
9411f68120SShawn Guo 	busy->shift = busy_shift;
9511f68120SShawn Guo 
9611f68120SShawn Guo 	busy->div.reg = reg;
9711f68120SShawn Guo 	busy->div.shift = shift;
9811f68120SShawn Guo 	busy->div.width = width;
9911f68120SShawn Guo 	busy->div.lock = &imx_ccm_lock;
10011f68120SShawn Guo 	busy->div_ops = &clk_divider_ops;
10111f68120SShawn Guo 
10211f68120SShawn Guo 	init.name = name;
10311f68120SShawn Guo 	init.ops = &clk_busy_divider_ops;
10411f68120SShawn Guo 	init.flags = CLK_SET_RATE_PARENT;
10511f68120SShawn Guo 	init.parent_names = &parent_name;
10611f68120SShawn Guo 	init.num_parents = 1;
10711f68120SShawn Guo 
10811f68120SShawn Guo 	busy->div.hw.init = &init;
10911f68120SShawn Guo 
11011f68120SShawn Guo 	clk = clk_register(NULL, &busy->div.hw);
11111f68120SShawn Guo 	if (IS_ERR(clk))
11211f68120SShawn Guo 		kfree(busy);
11311f68120SShawn Guo 
11411f68120SShawn Guo 	return clk;
11511f68120SShawn Guo }
11611f68120SShawn Guo 
11711f68120SShawn Guo struct clk_busy_mux {
11811f68120SShawn Guo 	struct clk_mux mux;
11911f68120SShawn Guo 	const struct clk_ops *mux_ops;
12011f68120SShawn Guo 	void __iomem *reg;
12111f68120SShawn Guo 	u8 shift;
12211f68120SShawn Guo };
12311f68120SShawn Guo 
12411f68120SShawn Guo static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw)
12511f68120SShawn Guo {
12611f68120SShawn Guo 	struct clk_mux *mux = container_of(hw, struct clk_mux, hw);
12711f68120SShawn Guo 
12811f68120SShawn Guo 	return container_of(mux, struct clk_busy_mux, mux);
12911f68120SShawn Guo }
13011f68120SShawn Guo 
13111f68120SShawn Guo static u8 clk_busy_mux_get_parent(struct clk_hw *hw)
13211f68120SShawn Guo {
13311f68120SShawn Guo 	struct clk_busy_mux *busy = to_clk_busy_mux(hw);
13411f68120SShawn Guo 
13511f68120SShawn Guo 	return busy->mux_ops->get_parent(&busy->mux.hw);
13611f68120SShawn Guo }
13711f68120SShawn Guo 
13811f68120SShawn Guo static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index)
13911f68120SShawn Guo {
14011f68120SShawn Guo 	struct clk_busy_mux *busy = to_clk_busy_mux(hw);
14111f68120SShawn Guo 	int ret;
14211f68120SShawn Guo 
14311f68120SShawn Guo 	ret = busy->mux_ops->set_parent(&busy->mux.hw, index);
14411f68120SShawn Guo 	if (!ret)
14511f68120SShawn Guo 		ret = clk_busy_wait(busy->reg, busy->shift);
14611f68120SShawn Guo 
14711f68120SShawn Guo 	return ret;
14811f68120SShawn Guo }
14911f68120SShawn Guo 
15011f68120SShawn Guo static struct clk_ops clk_busy_mux_ops = {
15111f68120SShawn Guo 	.get_parent = clk_busy_mux_get_parent,
15211f68120SShawn Guo 	.set_parent = clk_busy_mux_set_parent,
15311f68120SShawn Guo };
15411f68120SShawn Guo 
15511f68120SShawn Guo struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift,
15611f68120SShawn Guo 			     u8 width, void __iomem *busy_reg, u8 busy_shift,
15711f68120SShawn Guo 			     const char **parent_names, int num_parents)
15811f68120SShawn Guo {
15911f68120SShawn Guo 	struct clk_busy_mux *busy;
16011f68120SShawn Guo 	struct clk *clk;
16111f68120SShawn Guo 	struct clk_init_data init;
16211f68120SShawn Guo 
16311f68120SShawn Guo 	busy = kzalloc(sizeof(*busy), GFP_KERNEL);
16411f68120SShawn Guo 	if (!busy)
16511f68120SShawn Guo 		return ERR_PTR(-ENOMEM);
16611f68120SShawn Guo 
16711f68120SShawn Guo 	busy->reg = busy_reg;
16811f68120SShawn Guo 	busy->shift = busy_shift;
16911f68120SShawn Guo 
17011f68120SShawn Guo 	busy->mux.reg = reg;
17111f68120SShawn Guo 	busy->mux.shift = shift;
17211f68120SShawn Guo 	busy->mux.mask = BIT(width) - 1;
17311f68120SShawn Guo 	busy->mux.lock = &imx_ccm_lock;
17411f68120SShawn Guo 	busy->mux_ops = &clk_mux_ops;
17511f68120SShawn Guo 
17611f68120SShawn Guo 	init.name = name;
17711f68120SShawn Guo 	init.ops = &clk_busy_mux_ops;
17811f68120SShawn Guo 	init.flags = 0;
17911f68120SShawn Guo 	init.parent_names = parent_names;
18011f68120SShawn Guo 	init.num_parents = num_parents;
18111f68120SShawn Guo 
18211f68120SShawn Guo 	busy->mux.hw.init = &init;
18311f68120SShawn Guo 
18411f68120SShawn Guo 	clk = clk_register(NULL, &busy->mux.hw);
18511f68120SShawn Guo 	if (IS_ERR(clk))
18611f68120SShawn Guo 		kfree(busy);
18711f68120SShawn Guo 
18811f68120SShawn Guo 	return clk;
18911f68120SShawn Guo }
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